SAP Performance Tuning.ppt

8/9/2019 SAP Performance Tuning.ppt

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SAP Performance & Tuning

Bonus material for 201 ABAP Interview Questions

http://www.201interviewquestions.com/books/abap.htm

Material code : BM02

Author : P.Renjith umar

!enie Press
http://www.201interviewquestions.com/books/abap.htmhttp://www.201interviewquestions.com/books/abap.htm


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The Architecture level to improve performance

"he R#$ %&stem has a three'la&er client#server architecture(

)ith a Presentation la&er( an A**lication la&erand a +ata,ase la&er.

"he *resentation la&er and the a**lication la&er are scala,le.

"his means that if there is a hardware ,ottlenec-( &ou can etend the s&stem ,& addin/

more front ends and a**lication servers.

"he data,ase la&er( as the central data re*ositor&( is not scala,le.

Architecture


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ne /oal is to reduce the run time of *ro/rams on the a**lication server( there,& reducin/ the

P load.

Another /oal is to reduce the data,ase load. Reducin/ the data,ase load is *articularl& im*ortant

since the data,ase software is not scala,le.

If the re3uired data is in the R#$ ,ufferson the a**lication server( accessin/ them re3uires

a**roimatel& 0.1 millisecondsfor each data record.

If the data recordsare read from the data,ase ,uffer( around 1 millisecondis re3uired.

)hen the data is read from the dis-( this re3uires a**roimatel& 10 millisecondsfor each data

record.

ABAP performance analysis areas of focus.


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An R#$ wor- *rocess allocates around 5 MBof memor&.

"he R#$ ta,le ,uffers allocate a**roimatel&120 MB450 MB for sin/le record ,uffers( 60

MB for /eneric ta,le ,uffers7.

"he data ,uffers of the data,ase use around 500 MBof memor&. "he data,ase on the dis-s

can reach a si8e of several tera,&tes.

"he data transfer ,etween front end and a**lication server occurs in ,loc-s of2 KB

"he transfer ,etween a**lication server and data,ase server occurs in ,loc-s of u* to!2

KB.

Memory Allocation in SAP


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"or# process

)P )P )P )P

Roll area

)or- Process

To $B server

+is*atcher

+is*atcher Queue

%rom presentation server

A**lication server


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esponse time'

"ime from the recei*t of a user re3uest to the sendin/ of a res*onse 4 measured on the a**lication

server9 does not include networ- time ,etween the *resentation server and the a**lication server7.

$ispatcher (ait time'"ime s*ent ,& the user re3uest in the dis*atcher 3ueue.

oll)in'"ime re3uired to roll the user contet in to the R#$ wor- *rocess.

*oa+ time'"ime re3uired for loadin/ and /eneratin/ R#$ Re*ositor& or ABAP +ictionar& o,jects.

Processing time' res*onse time ' dis*atcher wait time ' roll'in ' roll'out ' load time ' data,ase

time en3ueue time ' roll wait time

,n-ueue time'

"ime from sendin/ an en3ueue re3uest to the R#$ en3ueue server to the recei*t of the results

.eneral $efinitions


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$ata/ase time'"ime from sendin/ an %Q; statement to the recei*t of the results 4measured on the

a**lication server9 includes networ- time ,etween the a**lication server and the data,ase server7.

oll (ait time'"ime in which the user contet is rolled out of the wor- *rocess *endin/ res*onse

to an R


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"or# *oa+ Monitor

%"0$ '= Performance +ata ,ase 4)or- ;oad Monitor 7

%elect %erver ( "ime .

If +B res*onse = >00 ms then there is fundamental *ro,lem with R$ # +B.

nitial hec#3s to /e +one to measure Performance


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ST 0!


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+B 01


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%M ?0


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SM504 %na* %hot anal&sis 7

"o identif& *erformance critical o,jects .

"o identif& lon/ runnin/ o,jects

@ow to identif& lon/ runnin/ *rocess

Refresh the screen continuousl& ( If a wor- *rocess is there

for a lon/ time then it is lon/ runnin/ *rocess

Im*ortant fields to -now a,out the action to ,e done : Action 4 Ta/le

Snap Shot Analysis


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hec- R$ ,ased )P overview from 4 SM507


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Select Proper internal ta/le types

%tandard "a,les :

sed /enerall& . an ,e sorted

%orted "a,les

%orted automaticall& ,ased on -e&

@ashed "a,les

sed when I record is to ,e retreived . !ood in *erformance . )or- ,ased on hash

e&

nitial eporting consi+eration


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Se! )6ABAP $e/ugger )6 Settings )6Memory $isplay 7n$e/ugger %in+ing Memory


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S,!0 8untime Analysis9

"he runtime anal&sis is an additional develo*ment wor-,ench tool that is 3uite useful for

anal&8in/ *erformance of an ABAP # 5 Pro/ram or transaction. )ith this tool( the s&stem can

dis*la& information a,out:

ecuted instruction

Accessed eecution time.

"a,les and "&*es of access.

hronolo/ical eecution flow

ST05 8S:* Trace9

he %Q; trace is a tool( which allows dis*la&in/ and anal&8in/ the contents for the data,ase

calls( which are made ,& the re*orts and transactions written in ABAP#5. It monitors *ro/rams

and transactions on the data,ase level. )ith the hel* of this facilit& for ever& o*en %Q;

instructions( &ou can dis*la&( a,out which %Q; m,edded 4+;AR( PC(


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ST 05 )6S:* Trace )6 Activate Trace

.o /ac# to S, !

Then un The program from S,! #?E@C#))ES2#!"4; creates more coding but is moreeffcient.

o( to improve Performance


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S>1 App. Servers #verview

STAT !isplay Statistical )ecords

ST9 S+L Trace

SE*9 )untime Analysis

ST9* Analysis of 'or8load

!$9% !atabase 2erformance B Tables and "nde,es.

!$9 Analysis of Table w.r.t. "nde,ed /ields

ST9- !atabase 2erformance Analysis B #racle ?iew

S>00 4lobal 'or8 2rocess #verview #ver All App ServersDS>9 2rocess #verview

Some useful Transactions relate+ to performance analysis

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SAP Performance Tuning.ppt

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